FantomXR Posted August 13, 2018 Report Share Posted August 13, 2018 Hey people, just a simple question: I have a use-case where I need 8 MIDI I/Os. Is this possible with the STM? What I read on ucapps is, that 4 I/Os are maximum. I wonder if there is an option to extend those MIDI I/Os. Thanks, Chris Quote Link to comment Share on other sites More sharing options...
latigid on Posted August 13, 2018 Report Share Posted August 13, 2018 Not enough UARTs for 8 MIDIO. You can expand with I2C (up to 8 output ports, perhaps inputs as well but normally only ins are used). Quote Link to comment Share on other sites More sharing options...
FantomXR Posted August 13, 2018 Author Report Share Posted August 13, 2018 Hey! Thanks! I just discovered, that Ploytec sells the GM5 in sets of 5 for 33€/5pc. I think I will take that solution! Quote Link to comment Share on other sites More sharing options...
Antichambre Posted August 13, 2018 Report Share Posted August 13, 2018 Or you just wait a few... I've got a surprise . Quote Link to comment Share on other sites More sharing options...
latigid on Posted August 13, 2018 Report Share Posted August 13, 2018 I didn't want to spoil it! Quote Link to comment Share on other sites More sharing options...
FantomXR Posted August 13, 2018 Author Report Share Posted August 13, 2018 Thanks for the link! This is not what I need. I need to make my own PCB because I'll integrate a circuit that allows transmitting MIDI over 50m via Ethernet. I'll just take two GM5 and I'm fine. That should work! :-) Quote Link to comment Share on other sites More sharing options...
Antichambre Posted August 13, 2018 Report Share Posted August 13, 2018 Just now, latigid on said: I didn't want to spoil it! No no don't worry, my fault I kept it secret, but it's ready now! Just now, FantomXR said: I need to make my own PCB because I'll integrate a circuit that allows transmitting MIDI over 50m via Ethernet. I'll just take two GM5 and I'm fine. That should work! :-) No SPI port on your "circuit"? Quote Link to comment Share on other sites More sharing options...
FantomXR Posted August 13, 2018 Author Report Share Posted August 13, 2018 (edited) Not yet. But as I said: I don’t need classic midi in / miidi out. I need Ethernet :-) Edited August 13, 2018 by FantomXR Quote Link to comment Share on other sites More sharing options...
Antichambre Posted August 13, 2018 Report Share Posted August 13, 2018 19 minutes ago, FantomXR said: Not yet. But as I said: I don’t need classic midi in / miidi out. I need Ethernet :-) Kissbox so. Quote Link to comment Share on other sites More sharing options...
FantomXR Posted August 13, 2018 Author Report Share Posted August 13, 2018 Although I have a RTP-OEM I will not use it in this case. I’ll use 2xGM5, which gives me 10 MIDI I/Os in total. I found that page which shows an easy way, how to transform MIDI into Ethernet and back to midi: https://www.edn.com/design/consumer/4368054/Send-MIDI-signals-over-long-distances Only a few parts are needed. Seems to be perfect because I still have some pins on the Ethernet-connector left to also transmit +5V and GND. Quote Link to comment Share on other sites More sharing options...
Antichambre Posted August 13, 2018 Report Share Posted August 13, 2018 Ah ok this is not ethernet! You will just use Cat5e cable to transmit a "balanced" MIDI. like the RS422 is the balanced version of the RS232 This is just an extender, that's great. Quote Link to comment Share on other sites More sharing options...
FantomXR Posted August 13, 2018 Author Report Share Posted August 13, 2018 Yeah! It’s not “real” Ethernet. But it seems to be a great option! Everything in one Cable (In / Out / Power). I today finished the reverse engineering of the official GM5-PCB from ucapps. From there I’ll create my special PCB. Quote Link to comment Share on other sites More sharing options...
Antichambre Posted August 13, 2018 Report Share Posted August 13, 2018 You know that you've got the same thing here with the line driver same principle ;) best Bruno Quote Link to comment Share on other sites More sharing options...
FantomXR Posted August 13, 2018 Author Report Share Posted August 13, 2018 I know that. But my use-case still is different and I don't like the big connector :-) Quote Link to comment Share on other sites More sharing options...
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